(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

How many electrons are transferred in the following reaction?

6 Br^- (aq) + Cr2O7^2- (aq) + 14 H^+ --> 2Cr^3+ (aq) + 7H2O + 3Br2 (l)

a) 1

b) 2

c) 3

d) 6

e) 14

2. Relevant equations

3. The attempt at a solution

Redox reactions really confuse me, but I gave it a shot. I took a look at the number of electrons on each side of the equation and found the following:

Left side:

6Br^- = -6

Cr2O7^2- = -2

14 H^+ = +14

Total: +6

Right side:

2Cr^3+ = +6

7H2O = 0

3 Br2 = 0

Total: 6

But this is as far as I can get. Somehow I don't think the answer is D) 6, but I really don't know. Someone please help me understand this problem?

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# Electron transfer in Redox equation

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